The only info found on the wiki is this
"Etrian Odyssey sold 33,216 copies in its first week of release. As of April, 2013, the game has sold more than 167,000 in the US and more than 301,000 copies worldwide. This makes it the highest selling Etrian Odyssey title to date."

If thats true that means the bulk of sales was outside japan. 12 millions ? thats impossible, even AAA titles dont sell such amounts.
I could say too, if they dont want my money ill spend it elsewhere but theres nothing similar coming out anytime soon, except eventually grimoire .